markdown 验证约束检查

Posted 2021-05-06

### Constraint
```
php/web/modules/custom/scmp_application/src/Plugin/Validation/Constraint/ApplicationEntityReferenceConstraint.php
```

### Validator
```
php/web/modules/custom/scmp_application/src/Plugin/Validation/Constraint/ApplicationEntityReferenceConstraintValidator.php
```

### alter
```php
function scmp_application_entity_type_alter(array &$entity_types) {
  $node = $entity_types['node'];
  /**
   * check the application of node and entity reference is same application id
   *
   * @see \Drupal\scmp_application\Plugin\Validation\Constraint\ApplicationEntityReferenceConstraint
   */
  $node->addConstraint('ApplicationEntityReference');
}
```